Code Signing Validation

What is Code Signing Validation?

Code signing validation is the process of verifying the digital signature attached to software artifacts (e.g., executables, libraries, scripts) to confirm the authenticity and integrity of the code. It ensures that a trusted source signed the software and hasn’t been tampered with since it was signed.

Why validate code signatures?

Unsigned or improperly signed code presents a significant security risk. Malicious actors often modify legitimate applications or inject malware into packages. Without code signing validation, end users and systems cannot confidently trust that the software is safe, unaltered, or from a verified publisher.

How code signing validation works

The validation process involves:

Extracting the digital signature from the software artifact
Verifying the certificate chain, ensuring it traces back to a trusted certificate authority (CA)
Checking revocation status using CRL or OCSP to see if the certificate has been invalidated
Confirming integrity by hashing the file and comparing it to the signed hash
Evaluating timestamping to verify that the signature was valid at the time of signing

Validation can occur on endpoints, during CI/CD workflows, or as part of artifact repository checks

Benefits

Prevents Unauthorized Code Execution: Blocks unsigned or altered software from running
Supports Regulatory Compliance: Required for secure boot, FDA, FedRAMP, and other frameworks
Protects Brand Reputation: Ensures customers only receive authentic, unmodified software
Enables Trusted Software Distribution:Establishes cryptographic assurance in the supply chain